The 1918 pandemic was triggered by a bird irus that mutated into one that could attack humans, going on to kill a staggering 50 million people worldwide in a matter of months.
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释义
1918年的广泛流行是由一个突变为可攻击人类的禽流感引起,此病毒在世界范围内几个月内持续导致5000万人死亡。
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